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Purigen® is a premium synthetic adsorbent that is unlike any other filtration product. It is not a mixture of ion exchangers or adsorbents, but a unique macro-porous synthetic polymer that removes soluble and insoluble impurities from water at a rate and capacity that exceeds all others by over 500%. Purigen® controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these harmful compounds. Purigen’s™ impact on trace elements is minimal. It significantly raises redox. It polishes water to unparalleled clarity. Purigen® darkens progressively as it exhausts, and is easily renewed by treating with bleach. Purigen® is designed for both marine and freshwater use.

I bought Purigen after researching online for a good way to remove tannins that were still leaching out from the driftwood in the tank. Carbon wasn't really up to the task. I needed large amounts of carbon and it didn't last long. So I tried the 100ml size and its rated for up to a 100 gallons and it comes in it's own mesh bag. In short it works! And though expensive, you can recharge it multiple times so in reality, its no more expensive than carbon. And works better too. Every month or so I take it out and recharge it. So far I have recharged it three times and its still doing it's job. I highly recommend this product!